<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
        <!-- 警告区域 -->
         <el-alert
         show-icon
            title="注意：只允许为第三级分类设置相关参数！"
            type="warning"
            :closable="false">
        </el-alert>
        <!-- 选择商品分类区域 -->
        <el-row class="cat_top">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                    v-model="selectedKeys"
                    :options="cateList"
                    @change="handleChanged"
                    :props="cascaderProps"
                    clearable
                >
          </el-cascader>
            </el-col>
        </el-row>
        <!-- tab页签区 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="small" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                    <template v-slot="scope">
                        <!-- 循环渲染tag标签 -->
                    <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <el-input
                    class="input-new-tag"
                    v-if="inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>  
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                    <template v-slot="scope">
                        <el-button type="primary" icon="el-icon-edit" size="small" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="small" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="small" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                    <template v-slot="scope">
                        <!-- 循环渲染tag标签 -->
                    <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                    <el-input
                    class="input-new-tag"
                    v-if="inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>  
                </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template v-slot="scope">
                            <el-button type="primary" icon="el-icon-edit" size="small" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="small" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <el-tab-pane label="自由创造区" name="third">暂无数据</el-tab-pane>
            <el-tab-pane label="保留区" name="fourth">暂无数据</el-tab-pane>
        </el-tabs>
    </el-card>
<!-- 添加参数的对话框 -->
    <el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="30%"
  @close="addDialogClosed">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 修改参数的对话框 -->
    <el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="30%"
  @close="editDialogClosed">
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
            cateList:[],
            //指定级联选择器的配置对象
            cascaderProps: {
                expandTrigger: "hover",
                value: "cat_id",
                label: "cat_name",
                children: "children",
                checkStrictly: false,
            },
            //级联选择框双向绑定
            selectedKeys:[],

            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态属性的数据
            onlyTableData:[],
            //控制添加参数对话框显示与隐藏
            addDialogVisible:false,
            //控制修改的对话框
            editDialogVisible:false,

            addForm:{
                attr_name:'',
            },
            editForm:{
                attr_name:'',
                attr_id:''
            },
            addFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'},
                    { min: 2, max: 10, message: "长度在 2 到 10 个字符", trigger: "blur" },
                ]
            },
            editFormRules:{
                attr_name:[
                    {required:true,message:'请输入要修改的参数名称',trigger:'blur'},
                    { min: 2, max: 10, message: "长度在 2 到 10 个字符", trigger: "blur" },
                ]
            },
            //控制按钮与文本框的切换与显示
            inputVisible:false,
            //文本框中输入的内容
            inputValue:''
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200)return this.$message.error("获取商品分类失败")
            this.cateList=res.data

        },
        //级联选择框选中项变化会触发这个函数
        async handleChanged(){
            // console.log(this.selectedKeys)
            if(this.selectedKeys.length!==3){
                this.selectedKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return  
            }

            this.getParamsData()
            
        },
        //
        async handleTabClick(){
            this.getParamsData()
        },
        async getParamsData(){
            
            //根据所选的分类id，和当前的所处面皮，获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200)return this.$message.error("获取动态参数失败")
            this.$message.success(`获取${this.titleText}成功`)
            // console.log(res.data)
            
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals?item.attr_vals.split(','):[]
            })
            // console.log(res.data.attr_vals)
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
            
        },
        //监听对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)return 
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,
                {attr_name:this.addForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==201)return this.$message.error('添加参数失败')
                this.addDialogVisible=false
                this.getParamsData()
            })
            
        },
        //点击按钮，展示修改的对话框
        async showEditDialog(attr_id){
            //查询当前参数信息
            
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {params:{attr_sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error("获取信息失败!")
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击确定修改参数信息
        editParams(){
             this.$refs.editFormRef.validate(async (valid)=>{
                if(!valid)return 
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==200)return this.$message.error('修改参数失败')
                this.$message.success("修改参数成功！")
                this.getParamsData()
                this.editDialogVisible = false
                
            })
            
        },
        //根据ID删除对应的参数项
        async removeParams(attr_id){
            const confirmResult =await this.$confirm(
                '此操作将永久删除该参数，是否继续？',
                '提示',
            {
                confirmButtonText:'确定',
                cancelButtonText:'取消',
                type:'warning'
            }
            ).catch(err=>err)

            //用户取消了删除的操作
            if(confirmResult!=='confirm'){
                return this.$message.info('已取消删除')
            }
            else{
                const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
                if(res.meta.status!==200)return this.$message.error('删除失败')
                this.$message.success("删除成功")
                this.getParamsData()
            }
        },
        //文本框失去焦点或者按下时触发
        handleInputConfirm(row){
            // console.log(row)
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                this.inputVisible=false
                return 
            }
            //如果没有return则证明输入的内容需要做后续处理。
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            
            //需要发起请求保存这次操作
            this.saveAttrVals(row)
            this.inputVisible=false

        },
        //按下按钮显示输入框
        showInput(row){
            this.inputVisible=true
        },

        //将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            //需要发起请求保存这次操作
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(',')
            })
            if(res.meta.status!==200){
                return this.$message.error('修改数据项失败')
            }
            this.$message.success('修改参数成功')
        },

        //删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed:{
            //如果按钮需要被禁用，则返回true，否则返回false
            isBtnDisabled(){
                if(this.selectedKeys.length!==3){
                    return true
                }
                else{
                    return false
                }
            },
            //当前选中的三级分类ID
            cateId(){
                if(this.selectedKeys.length===3){
                    return this.selectedKeys[2]
                }
                else{
                    return null
                }
            },
            //动态计算标题文本
            titleText(){
                if(this.activeName==="many"){
                    return "动态参数"
                }
                else{
                    return "静态属性"
                }
            }
        }
}
</script>

<style scoped>
.cat_top{
    margin:15px 0;
}
.el-tag{
    margin: 5px;
}
 .button-new-tag {
    margin-left: 10px;
    height: 32px;
    line-height: 30px;
    padding-top: 0;
    padding-bottom: 0;
  }
  .input-new-tag {
    width: 90px;
    margin-left: 10px;
    vertical-align: bottom;
  }
</style>